HOUSING 8W8124 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the sensor. Also use this procedure if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
CDL Code J1939 Code Code Description Comments
110-3 110-3 Engine Coolant Temperature Sensor : Voltage Above Normal The code is logged if the engine has been running for more than seven minutes and an open circuit has been detected.
110-4 110-4 Engine Coolant Temperature Sensor : Voltage Below Normal The code is logged. The ECM detects voltage that is not in the acceptable range.
174-3 174-3 Fuel Temperature Sensor : Voltage Above Normal The code is logged. The ECM will flag the fuel temperature as invalid data and the fuel temperature is set to a default value of 40 °C (104 °F).
174-4 174-4 Fuel Temperature Sensor : Voltage Below Normal
1836-3 1385-3 Auxiliary Temperature Sensor : Voltage Above Normal The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.
1836-4 1385-4 Auxiliary Temperature Sensor : Voltage Below Normal The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.
2526-3 172-3 Air Inlet Temperature Sensor : Voltage Above Normal The code is logged.
The ECM detects voltage that is not in the acceptable range.
2526-4 172-4 Air Inlet Temperature Sensor : Voltage Below Normal The code is logged.
The ECM detects voltage that is not in the acceptable range.
3372-3 2630-3 Engine Charge Air Cooler #1 Outlet Temperature Sensor : Voltage Above Normal The code is logged.
The ECM detects voltage that is not in the acceptable range.
3372-4 2630-4 Engine Charge Air Cooler #1 Outlet Temperature Sensor : Voltage Below Normal The code is logged.
The ECM detects voltage that is not in the acceptable range.
3386-3 412-3 EGR Temperature Sensor : Voltage Above Normal The code is logged.
This code will not become active during Cold Mode. Run the engine to exit cold mode before troubleshooting a 3386-3 code.
The ECM detects voltage that is not in the acceptable range.
3386-4 412-4 EGR Temperature Sensor : Voltage Below Normal The code is logged.
The ECM detects voltage that is not in the acceptable range.
3683-3 442-3 Auxiliary Temperature #2 : Voltage Above Normal The code is logged.
The ECM detects voltage that is not in the acceptable range.
3683-4 442-4 Auxiliary Temperature #2 : Voltage Below Normal The code is logged.
The ECM detects voltage that is not in the acceptable range. System OverviewThe sensor signal for the passive sensor is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the passive sensors is routed to the ECM from terminal 2 of each sensor connector.Diagnostics on the Caterpillar Electronic Technician (ET)Wiggle Test - The Wiggle Test allows you to monitor the status of the signals from the sensors.For additional information regarding the Wiggle Test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g03330022
Schematic for the passive analog sensors
Table